Answer: A) Mustn't
Explanation for this question is being written.
Answer: B) Must
Answer: A) Must
Answer: C) Mustn't
Answer: D) Must
Answer: B) Must stop.
Answer: B) MUST
Answer: B) Passengers mustn't use their mobile phones during the flight.
Answer: B) B
Answer: D) Ella debe hacer su tarea.
Answer: B) Mustn't
Answer: A) Obligation in the present.
Answer: C) Must not.
Answer: B) I must back home immediately. It's almost dark.
Answer: C) Must
Answer: B) Obligation or command.
Answer: A) Couldn't
Answer: C) Prohibition.
Answer: B) MUSTN'T
Answer: C) Don't have to.
Answer: A) Must/have to.
Answer: C) Talk
Answer: B) Modal for obligation.
Answer: B) Incorrect
Answer: B) Are to.